Answer/spoiler
It's the base of a cooling tower of the abandoned, unfinished Phipps Bend Nuclear Plant in Tennessee
A reply...
2590 A.D archaeologists:
This was clearly a sacred place for sacrifices to the Sun God.
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It's the base of a cooling tower of the abandoned, unfinished Phipps Bend Nuclear Plant in Tennessee
A reply...
2590 A.D archaeologists:
This was clearly a sacred place for sacrifices to the Sun God.
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I didn't guess it right. But it reminded me of some of the theories about the Egyptian pyramids, including that they were an energy generating device.